﻿// Copyright 2004-2011 Castle Project - http://www.castleproject.org/
// 
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// 
//     http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#region 导入名称空间

using System.Diagnostics;
using System.Reflection;
using System.Reflection.Emit;

#endregion

namespace LightWork.DynamicProxy.Generators.Emitters.SimpleAST
{
    [DebuggerDisplay("{fieldbuilder.Name} ({Fieldbuilder.FieldType})")]
    public class FieldReference : Reference
    {
        private readonly bool isStatic;

        public FieldReference(FieldInfo field)
        {
            Reference = field;
            if ((field.Attributes & FieldAttributes.Static) != 0)
            {
                isStatic = true;
                owner = null;
            }
        }

        public FieldReference(FieldBuilder fieldbuilder)
        {
            Fieldbuilder = fieldbuilder;
            Reference = fieldbuilder;
            if ((fieldbuilder.Attributes & FieldAttributes.Static) != 0)
            {
                isStatic = true;
                owner = null;
            }
        }

        public FieldBuilder Fieldbuilder { get; }

        public FieldInfo Reference { get; }

        public override void LoadAddressOfReference(ILGenerator gen)
        {
            if (isStatic)
                gen.Emit(OpCodes.Ldsflda, Reference);
            else
                gen.Emit(OpCodes.Ldflda, Reference);
        }

        public override void LoadReference(ILGenerator gen)
        {
            if (isStatic)
                gen.Emit(OpCodes.Ldsfld, Reference);
            else
                gen.Emit(OpCodes.Ldfld, Reference);
        }

        public override void StoreReference(ILGenerator gen)
        {
            if (isStatic)
                gen.Emit(OpCodes.Stsfld, Reference);
            else
                gen.Emit(OpCodes.Stfld, Reference);
        }
    }
}